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5 (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 5 - 2016 - Paper 1

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5 (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer. Aluminium is extracted from aluminium oxide by electrolysis. The overall equ... show full transcript

Worked Solution & Example Answer:5 (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 5 - 2016 - Paper 1

Step 1

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

The correct answer is B. aluminium oxide is reduced. In the extraction of aluminium from aluminium oxide, aluminium ions are reduced to form metallic aluminium.

Step 2

Explain why.

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Answer

Lead is less reactive than carbon, which allows it to be displaced from its oxide by carbon. Unlike aluminium, which requires electrolysis due to its higher reactivity, lead can be extracted using a chemical reaction where carbon reduces lead oxide to lead metal. This reaction occurs as follows:

ightarrow ext{ Pb (s) + CO (g)}$$ In this reaction, carbon reacts with lead oxide to produce lead and carbon monoxide.

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